Punching device.



P. B. ROGERS.

PUNCHING DEVICE.

APPLICATION FILED 1120.1, 1911.

Patented Apr. 16, 1912. I

UNITED STATES PATENT QFFICE.

PEARLEY B. ROGERS, OF LYNN, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MACHINERY COMPANY, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

PUNCI-IING DEVICE.

Application filed December 1, 1911.

To all whom it may 0011 com: 1

Be it known that I, PEARLEY B. ROGERS, a subject of the King of England, residing at Lynn, in the. county of Essex and State of 5 through. the center of the ball.

Massachusetts, have invented certain Improvements in Punching Devices, of which the following description,in connection with the accompanying drawings,is a specification, like reference characters on the drawings indicating like parts in the several figures.

This invention relates to devices for punching sheet material and'is herein shown as embodied in an eyeleting machine organized to punch holes in upper leather, cloth or the like, insert eyelets in the punched holes and clench them upon the material.

Heretofore it has been found diflicult to punch clean holes in certain kinds of material, for example, the batiste of which corsets are made, andespecially has this been the case when the punching operations must be effected at a high rate of speed, as in an eyeleting machine running at 300 or 400 revolutions per minute. It will be apparent that if a single thread remains unsevered in the punching operation the piece of material cut out in forming the hole will remain in the vicinity of the hole instead of being entirely freed from the work and this piece is likely to become caught under the flange of the eyelet whence it must be dislodged with more or less difficulty and waste of time.

It is, accordingly, an object of this invention to provide punching devices by the employment of which the difficulties above discussed may be obviated and certain other advantages secured.

It has been discovered that a tubular punch, cooperating with a cutting block comprising a ball of greater diameter than the internal diameter of the punch can be operated successfully upon all classes of sheet material. This combination,therefore, constitutes an important feature of the pres ent invention.

Another feature of the invention relates to the manner of mounting the ball cutting block and consists in supporting the ball loosely in alinement with the axis of the tubular punch so that the ball may automatically center itself at each operation and insure perfect contact with the cutting edge of the punch. As herein shown this may Specification of Letters Patent.

, Goddu.

Patented Apr. 16, 1912.

Serial No. 663,397.

be effected by mounting the ball upon a holding pin disposed substantially at right angles to the axis of the punch and having a diameter less than that of a hole extend- An important application of the present invention is in a machine of the duplex type wherein is arranged a pair of opposed punches. In applying the invention to this type of machine the ball cutting block will be mounted so that its opposite sides are exposed and means are provided for adgapcing each punch against the sides of the In addition to the great advantage clerived from the clean cutting properties of the tubular punch and cutting ball it will be noted that punches of various diameters may be used in connection with the same cutting balland that the necessity is avoided of producing the perfecting fitting elements required in punch and die outfits. It has been found that the best results are obtained when the internal diameter of the tubular punch is substantially equal to the radius of curvature of the ball cutting block but the invention is in no sense limited to punch and ball cutting block bearing this specific relation.

The advantages above mentioned and others incident to the invention will be best understood and appreciated from the following description of a preferred embodiment thereof selected for purposes of illustration and shown in the accompanying drawings, in which,

Figure 1 is a view of the operating parts of the machine in side elevation; Fig. 2 is a view in perspective of the holder for the ball cutting block; Fig. 3 is a sectional view of the device shown in Fig. 2 showing also the punches partly in section; Fig. 4 is a similar view illustrating the employment of punches of diflerent diameters.

The invention is herein shown as embodied in a duplex eyeleting machine of the type disclosed in Letters Patent of the United States No. 93%,066 and granted September 1 1, 1909 on an application of George As in the machine of said patent, the forked head 10 is provided with bearings for the opposed setting dies 12 and punches 14 and has rigidly set therein an anvil plate 16 in which are mounted the double faced upsetting die 18 and the ball 'lets are delivered, inserted and clenched by the action of the setting dies 12. The punches are actuated by levers 15 operated by a suitable cam or cams, not shown, and are retracted by the spring 28 acting through the arms 24 and connected at their forward ends with the outer ends of the punches. The setting dies may be actuated in any convenient manner, and, as herein shown, are retracted by the action of the spring 30 upon the arms 26 similar to those which act upon the punches.

The ball 20 with which the tubular punches cooperate is preferably constructed of hardened steel and has a radius of curvature substantially equal to the internal diameter of the punch with which it cooperates. As shown in Fig. 3 the ball 20 is mounted within a recess in the anvil plate 16 by being perforated diametrically and threaded on a pin 22 which extends longitudinally of the anvil plate 16 and substantially at right angles to the axis of the punches. The diameter of the perforation in the ball 20 is slightly larger than the diameter of the pin 22 so that the ball is free to turn or move somewhat in order to center itself when engaged by one or both of the tubular punches. The pin 22 is retained in the anvil plate 16 by means of an enlarged threaded portion adjacent to its head which is threaded into the end of the anvil plate 16.

It will be apparent that the punches may be of difl'erent diameters if desired and such an arrangement is illustrated in Fig. 4 in which the punch 45 is shown as having a smaller diameter than the punch 4A. It will be further understood that the term tubular punch as used herein should not be limited by implication to include only tubular punches of circular outline but that it is within the scope of the invention to employ a tubular punch having its outline curved to correspond with the style of eyelets to be set and a cutting ball with its, surface shaped to cooperate properly with the punch.

Having thus described my invention,

Copies of this patent may be obtained for what I claim as new and desire to secure by Letters Patent of the United States is 1. A machine for punching sheet material having, in combination, a tubular punch, and a cooperating cutting block comprising a ball of greater diameter than the punch.

2. A machine for punching sheet material having, in combination, a tubular punch, and a cooperating cutting block comprising a ball having a radius of curvature substantially equal to the diameter of the punch.

3. A machine for punching sheet material having, in combination, a tubular punch, a holding pin disposed at right angles to the axis ofsaid punch, a perforated ball mounted upon said pin in alinement with said punch, and means to force said punch against said ball to perforate the work. I

4. A machine for punching sheet material having, in combination, a tubular punch, a hardened ball of a diameter not less than twice that of the punch located in alinement with said punch but loosely mounted in order that it may be automatically centered when engaged by said punch, and means for relatively moving said punch and ball.

5. A machine for punching sheet material having, in combination, a pair of opposed tubular punches, a ball located in alinement with and between said punches, and means for simultaneously advancing Isoaid punches toward opposite sides of the all.

6. A machine for punching sheet material having, in combination, a pair of opposed tubular punches, a ball loosely mounted in alinement with and between said punches, and means for advancing both punches toward said ball.

7. A machine of the class described having, in combination, a pair of opposed tubular punches of difierent internal diameters, a hardened ball locatedin alinement with and between said punches, and means for advancing either or both of said punches toward said ball whereby a hole of one size may be formed in material presented on one side of the ball and a hole of another size in material presented on the other side of the ball. I

In'testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

PEARLEY B. ROGERS.

Witnesses HERBERT W. KENWAY, FRED W. GUIBoRn.

five cents each, by addressing the .Coinmissioner of Patents, Washington, D. 0. W. 

